fain vs disposed

fain and disposed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fain	No	Yes	No	Yes
disposed	No	Yes	No	No

As adjectives, fain and disposed are synonyms defined as:

Other synonyms of fain include inclined, prepared.

fain (adjective)	disposed (adjective)
having made preparations	(usually followed by `to') naturally disposed toward
	having made preparations

fain (adverb)	disposed (adverb)
with pleasure